Portable power supply



FIG. 1 is a perspective view of a portable power supply showing my newdesign;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a right side view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines depict portions of the portable power supply that formno part of the claimed design.

CLAIM I claim the ornamental design for a portable power supply, asshown and described.